Latia's eyes slowly opened. By her estimation, it should be daytime by now.

Unless she slept through the whole day. But, then again this place is underground meaning telling time can be difficult.

Then again she shouldn't worry about time. Since her timing to wake up is not decided by her anymore.

'I don't remember falling asleep on clouds…' Her eyes scanned the surroundings. It looked like they were sleeping in the night sky itself. Everywhere she looked were an endless sky. Above where the ceiling was full of stars…

'Even the bedrooms are packed full of holograms… Marcus is not holding back with anything. This kind of technology would completely and utterly change the current world. Most likely the Underworld as well. Our society is closely related to the current human one.'

As Latia was thinking about the abundance of the holograms everywhere she slowly felt Marcus waking up as she was partially sleeping on him. Behaving like a proper lover should.

Soon enough she felt his hand stroking her back.

"...how can you tell time in this place?" She asked softly. The blonde realised that her mouth was dry as her voice quite dull.

The moment asked that one of the clouds transformed into a clock showing the time.

[12:37]

Her eyes widened as she realised that it was past afternoon already. This was the first time in her life she overslept so much!

"It's only part twelve…" Marcus said with a lazy tone. He started moving. Soon enough she realised that he moved into position to hug her more.

And… she felt his hard rod close to her special place.

'By the Satans we fucked through most of night and early morning… he still raring to go more?'

Latia knew somewhat because she remembered seeing the sun going up some time ago. Assuming it was direct sunlight mirroring of some sort…

"You already rearing to go for more?~~~" The blonde asked with a slightly hot tone. She positioned the way that she could speak into his ear.

"...I got reminded that you are in my bed. So, it was a natural reaction." He said that while his rod started to sink into her folds. The beauty slightly moaned feeling that.

"I...see~~~ well, then… I will take care of it~~~" As she said that as the blonde moved making Marcus lay on his back while she end up on top of him.

The teen inventor could see the serious look the beauty had. Even though this is what people call a morning 'quickie'.

She was dead serious to satisfy him.

Before long she was moving on his pole with slow movement. Latia was getting the hang of this with each movement of hers. Which was very much satisfying to Marcus as the beauty was rapidly learning. He never knew devils could adapt so quickly. It was a very welcoming surprise.

Sure enough, she put both of her hands on his chest before raising her bum up and down while softly moaning to him. She made sure to look directly into his eyes while doing that.

A few moments later she leaned forward more making her large breasts end up in Marcus face sure enough he started assaulting her nipples. She wasn't expecting that as that moment a current of positive pleasure washed her over and she came hard around his pole.

That moment her movement stopped and Marcus used that to start hammering into her from below.

"Annhhh~~~ w-wait..."

Before she can say more she received her morning load and her body once more was washed over with pleasure. The blonde almost passed out but she hold herself. Instead, she wrapped her hand around his head and just rested there a few minutes.

Eventually, she recovered somewhat and realized that… he was still hard…

She was about to return to her task of pleasuring him, but she remembered that this was the perfect time to get something that she wants…

The blonde slightly changed her position. Nonetheless, she was still on top of him and they were still very much connected.

"Tomorrow...I will do some tasks for you, yes?~~~" Latia asked as she was moving her hips. Trying to focus on both thinking and sex… it was a very hard task…

"...Yeah… those companies… Aurora will set up some things… it will be easier for you…" Marcus said that as he looked at her 'dancing' form.

"Wonderful… may...I… open more companies? Like... energy...and~~~ ohhh~~~ food?" Latia said that with glassy eyes. She nearly forgot what she wanted to say. Slowly her brain start only thinking about cock moving in and out of her slippery cunt but through sheer will, she remembers what she wanted to do.

"...Sure… since you want it…" Marcus grabbed both of her hips and started pumping into her from below. A loud smacking sound started to spread through the room.

Hearing all-clear she can give herself to the morning pleasure…

~~~~~~Kuoh~~~~~~

Serafall appeared in the living room of Sitri Estate. She with a huff walked over and took a seat on a couch. She closed her eyes and started to think.

Some time has passed but her baby sister was finally here…

"Sister?"

"So-tan. Sit." The Leviathan motioned for her baby sister to sit opposite to her.

The younger Sitri quickly ended up sitting. She was nervous as hell. She can't remember when she saw Serafall like this. Closest Sona can remember is when she was acting all Leviathan to her and Rias…

But, it wasn't that bad as it is now…

"Marcus has been smitten by Latia Astaroth."

"Eh?"

The younger black-haired beauty tried to process what she just heard.

How on Earth did Latia Astaroth end up meeting Marcus!?

"Honestly this was my idea to bring her into the fold but Astaroth intellectual trait clicked far too well with him combined with her upbringing she fit like glove to him," Serafall said with a serious tone.

"So...um...what does this mean?" Sona was somewhat clueless about what to say. Not like he is going to stop supporting them right?

"I do not wish to lose my spot in this!" Serafall said that with a nearly insane crazed look.

Like, hell! A Satan will lose to a mere 16-year-old devil girl! This is nuts!

"So...what does this...mean?" The younger Sitri asked cautiously she doesn't want her sister to snap.

"We are going to double team him. Or you can kiss goodbye to your future support from him." Serafall said that simply because she knew Sona could persuade him differently. He is always ready to accept more test subjects. But, it would mess up older Sitri chances to his favourite!

"...this… you think it can happen?" Sona asked with a nervous gulp.

"You might not going to lose anything, but your chances of getting much more advanced items, gears, and knowledge will be extremely limited!

At the moment you only scraped the tip of the iceberg of what he could create for you!" Serafall said with an extremely serious tone.

"...So you want me to join you in this whole debauchery you are cooking up?" Sona asked with a tired sigh. there was some blush on her cheeks.

"Not that you have a Fiance..." Black-haired Satan said with an eye roll.

"I doubt I can escape from him after we cross that line. I am pretty sure I am signing away my future love life." The younger Sitri said that with another sigh.

While the older sibling instantly got a dull look hearing that.

"Sona… do you even hear yourself? Future love life? You do realise that you are the Heiress of the Sitri family? Holding rank of Prince in Underworld? You are not some Human high school girl who thinks all day and night about boys, shoes and purses.

The only reason you are not engaged to anyone is because you hide behind your ability in chess and me. Eventually, the council will get tired that one of the highest-ranking Pillar houses is not doing what is supposed to be doing." Serafall said with a tired sigh.

"...You telling me they going to force me to marry either way?" Sona asked with a slightly panicked look. She thought she got this covered with her chess!

"Sona… only if you have exceptionally high power, have an incredible record in Rating games, only then you do whatever you want to do.

Council only cares that the devil race continues to survive and produces powerful pureblood devils. They are not able to do anything if an exceptionally powerful devil opens a rating game school for everyone." Serafall said that with a casual shrug.

The younger Sitri eyes widened she that moment realised what this means.

If she is very powerful she then can do whatever she wants! Her dream of opening the school will be easily achieved! She will be able to open schools like that all over Underworld!

"You are right… I forgot the most important part about our society…very well, I accept this… I will be part of your schemes…

Though, it's going to be difficult. Latia Astaroth… is the perfect model high-class Devil. This means she is ambitious, cunning, and from the looks of it, she already seduced him." Sona said with a thoughtful look. The younger Sitri for a second blushed imagining that Latia already most likely sharing bed with Marcus…

"Yes. All of it. The key part is that Latia is intellectual. Meaning that he is coming to her himself."

Sona nodded hearing that. Yes, the Astaroth clan is known for their intellectuals. Even that idiot Diodora has slightly above average acting ability and pass off as an 'intellectual' not that it escaped from her, she saw through it…

"This leaves only possible when Latia is not around him then."

"Don't worry. All you need to do is be ready I will do the rest."

Serafall got up from the couch, moments later she disappeared and returned to her office.

Is Satan Leviathan has some sort of feeling of guilt for manipulating her younger sister? Not at all. Especially when she manipulated her towards something which will make her more influential and hopefully away from regular mundane human mindset. Those are only making her baby sister duller

~~~~~~Marcus Base~~~~~~

I looked at the beauty sitting opposite of me enjoying our breakfast. Well, calling them breakfast is quite silly as it was past 4 afternoon. It could be easily called dinner by this point.

Latia is quite a beauty which I tried to recall most of yesterday. Sadly I remembered nothing about her from whatever things I can recall from the books.

All, I can say that I am very much satisfied with her and that 'like' rating is going up in my books the more I talk with her and of course enjoy her silly seductions.

Silly for the simple reason that she will most likely end up fucked into sleepiness which happened already.

"...I haven't seen any of your maids. I thought that those two serving you like maids should?" Latia asked me, as she noticed my gaze.

"They don't work weekends. They choose that themselves." I said with a shrug.

"And you allow it?" The blonde asked with disbelief.

"It works the same as everywhere else. If they work less they earn less. If there is mess created somewhere over the weekend they will need to work extra for the same amount of points." I explained to her how it works.

"...I see. You indulge them in their desire to be lazy for those two days. But, they have to pay it back later." She explained how she saw.

It's so fascinating to listen to how she comes up with her correct answers. The blonde beauty of mine only missed her mark a few times.

Which was at the start, when I summoned her.

"In a way. Yes, I am making them work hard because they will be rewarded at the end of it." I explained to her as I took a sip of my morning tea.

"Right… you did tell me that they are getting paid by some sort of points and they are part of the system of some sort." She said that while having a thoughtful look.

I am impressed, I only mention it of-handily and she remembered it!

"Indeed."

"Perfectly honest. It is difficult to work here. The amount of… distractions… like Entertainment Dome. It's no wonder they take two days off…" She said that with an amused tone…

For a second I thought about this. Yes, it would seem the girls did become quite addicted to my stuff. It kind of pissed me off. But, the larger part is that I am satisfied that my stuff makes them so sucked into it.

It shows that my things are doing what they suppose to be doing.

"I suppose, you are right. You can take them with you if you wish for assistants when you run the companies."

One of her eyes went up for a second before she got a thoughtful look, she took a sip from her morning coffee, it was extra strong. Because of the extra hard morning she experienced.

"Speaking of companies, you will allow me to open one for cheap energy, food and medicine yes?" She asked while fluttering her eyebrows at me.

"We agreed on energy and food. Nothing on medicine. My medicine research is not complete yet." I said with an amused smile. This vixen is amusing. I will have fun with her.

"I see. So, you do study medicine then?" She asked curiously while continuing to eat her extra protein full breakfast. The beauty wants to recover from her morning 'exercises'.

"Not medicine. Life and genetics in general." I casually said that as I finished off my sandwich.

"... And how much did you uncover? It's quite a broad spectrum of studies." Latia asked with intrigued look.

"The DNA I have already fully decoded and found patterns how to decode the genome even faster of new samples.

For example, I already know how to solve alot of human issues which come from inborn diseases and ageing problems. Like organ failures and other things. Tracing from that I found how to heal other things like cancer, and other stuff. It's quite boring after you discover what makes things click.

I left the majority of the calculation to Aurora, I stopped bothering with it. Now however I am working on people souls and Lifeforce."

"Isn't it what medicine does?" She asked after processing what I said.

"Nope. This is working directly with one's body. It can potentially hurt alot. DNA alterations could kill a person if not proper application is introduced. While medicine is pellets, capsules or whatever else they use nowadays.

If you want me to open a company for this. We gonna need to build facilities and whatever else there is. It's far more difficult than energy or food." I explained to her how big a pain in the ass that is.

"I see… I am sorry for asking this." She properly apologised. Nonetheless, she had a look that she won't be forgetting this.

Well, all she needs to do is persuade me and I might waste some time on this issue.

"Don't mention it. For now, you have other things to do."

"Yes… how you wish of me to proceed?" She asked quite seriously.

"Aurora will deal with all electronic side of things. You only need paperwork and manpower to be done." I said simply.

"I can assume you will deal with the products and the rest for me? The shops and its management?" She asked with raised eyebrow. I can see she was thinking about this.

"Indeed I will give you the products and you will be selling them. About the energy and food. We will discuss that separately."

Her eyes widened for a bit as she blushed hard. I gave her a knowing smile. We will 'discuss' it properly…

"Yes… of course…" She said that while her fingers played with her blue hair tips. I know that she does this when she is nervous.

"On manpower and shops, I don't care how you run Latia. Know that my nation and its take over is a priority. I know that companies from overseas and other nations will want to take over or buy our companies off.

The profits doesn't matter only the influence. By the end of this all, I want to do whatever I want in the open without worries."

She patiently listen to me. Latia had satisfying look. Assuming that the freedom will receive is to her satisfaction.

"I see… so you don't mind who I will hire?" She asked after hearing all that.

"Nope. You can employ your whole extended family. It doesn't matter to me as long as they do what they are hired to do."

"I understand. This task I won't going to fail you. Your trust in me won't going to be wasted." She said with a very serious tone.

Honestly, she looks hot with that serious tone. Once again I have the urge to snog her…

~~~

After 'breakfast' we spend the rest of the day in each other company. Honestly, it was very hard to keep my hand off her.

Sadly Sunday was off and we had to return to a boring weekday schedule. Serafall took Latia away to start training in her office. Normally, if not Ars Goetia I would be quite afraid for my dear blonde beauty.

Since Serafall is quite annoyed and even pissed off with the blonde.

Thankfully, her jealously is severely dulled off…

After that, I went to school, which gave me some time to think. Once classes were done I returned to my mundane home and took a 10-minute ride on my new train to my workshop. Each time I used it only reinforces my idea to build tracks outside for the stretch from space centre to docks…

Anyway…

"Show me the genome upgrade progress," I asked Aurora after getting comfortable in my posh chair.

[Certainly] Quinella appeared next to me as she took her position to my side.

She lifted her hand and above her hand the DNA manifested.

The hologram next to it showed [97.64%]

[Approximately, 45 million simulations have been run. I used. Many, many, different scenarios. And exposures to your genome.]

[By this point I have solved all the issues of the human part, hidden diseases which could manifest, at this time I am simulating what could happen with those upgrades, possible positive side effects.]

I nodded at her, with a hand swap I made the image of upgraded me appear next to my regular image. The outside changes are minimal. Slightly taller, sharper gaze, more developed muscles. Nothing too massive will change.

Except Quinella thinks differently, as she was looking at my future image with some drool. I can't believe she making her holographic form do that…

"By this point, you are just doing one of what-if scenarios. Like the alternative history of Earth." I said with a sigh.

[Please. You know quite well that I can run those with two hands behind my back! Remember I did that what if Darth Vader invades Earth simulation? You enjoyed it quite a bit!]

I massaged my temples for a bit after hearing her saying that with such a straight face. Seeing beauty like Quinella talking about my childhood delusion which now I can make reality is quite embarrassing…

[I did love how you just stole that Imperial Star Destroyer. And tried to park it in your backyard… you should however use my help to do the math.] She said that with a thoughtful look.

By this point, I just wanted to hide somewhere. That simulation was me doing whatever I wanted with Empire's invasion force...

A simple math revealed that the empire would only send a single Imperial Star Destroyer. Which I stole and tried to park. Well… it didn't end well. I didn't use any of my high tech gadgets. This simulation revealed how bad I was without them.

"Right… can we drop this embarrassing moment?"

[But it was cute! Besides, its thanks to that Sitri's Bishop idea of Darth Vader that you came up with Entertainment Dome and Realitus technology. I am still shocked how simple mentioning can lead to hyper-realistic Holographic technology.]

I rolled my eyes at her. But, yeah Momo mentioned Darth Vader and I wanted to push my tech further. By that point, Aurora couldn't do what we see in Entertainment Dome. It didn't mess up with perception. Thus big amount of space was needed.

Realitus particle with Prism light technology. The two things which I installed in the newest phones and pretty much everywhere in the span of a weekend. Allows for humans to experience reality warp.

A simple room that is smaller than my original garage workshop can turn into a galaxy far far away just how Jeanne has been experiencing over her weekends the ultimate self insert experience without being removed from your reality by an omniscient being.

"Yeah… show me Project Biological Assistant Quinella."

My question quickly shifted her and she for a second got nervous without telling anything she opened a new window. Showing imagine of herself and complete percentage…

[~37.12%]

"I see… so we do need to get some more outside resources."

[I could… continue with the work… it's just that… those unknowns… they are annoying…]

I nodded at her. With hand motion, it shown that scientifically I could easily make her biological body. But magically side telling me that it will be nothing more than a flesh bot.

An organism machine, not an alive being. Not an alive superior being with access to my network.

Nope. It's not good enough…

"We need more data. A specific item is needed to shave millions of unnecessary calculations. Instead of using concept manifestation magic and blindly manifested 'souls' and 'lifeforce' to study it, we are going to get the grail."

Quinella quickly opened multiple tabs on 'Grail' cross-referencing with what she found and data she has on the supernatural world.

Ending up with.

[Sephiroth Graal, one of top tier Longinus-Class Sacred Gears. The current possessor is unknown to me.] That moment her eyes widened and looked at me

[So, you know! but you did not update my data!] She said with a pouty look.

"Yep. Start a new project for me. Name it Inventor's muscles."

[...You got to be kidding me! It's lame!] She pouted more at me. But, the file with that name appeared.

"You would prefer bandits or Empire's finest? Or something in between."

She eye-rolled at me.

[Just use Biological models. By this point, we are making to what magicians call Homunculus. Except ours are purely science with some magical support.] She said with a sigh.

"Scientifically produced biological army? S.P.B.A forces? Kind sounds...serious?

[You call anything with capital letters serious. But it's much better than Inventor's muscles… ] She said while nodding at me. She changed the folder name in Scientifically Produced Biological army. I could add some more for seriousness sake. Like Armed Forces instead of army…

Oh, well. Four letters are enough…

"Right then… let's return to designing. This will help when we will be creating your body."

She nodded at me and oped designer windows. Hard light holograms turned into drawing tools next to me. Full pallet of tools for drawing. It was time to design some biological chambers.

'Maybe some bacta tank-like thing for Latia? She will eventually remind me of Medicine… Hmm… let's see what I can do with that.'

~~~

After a day of designing extended facilities to my biological wing. My base should expand by around 30% by the end of the week. I should add some machinery for my S.P.B.A force too.

'An aircraft carrier?'

Yeah… I will need one to carry stuff as I go around the world collecting items… changing ownership of certain poorly protected items and things like that.

Eventually, I walked back to my quarters… for a second my brain stopped for a bit as I saw my bed occupied by a pair of devils. Latia and Serafall were there.

"Long day? Thankfully you have your devil ladies to take care of you~~~" Serafall quickly enough walked behind me and pulled me into the bed.

The blonde quickly joined me.

For a second I smirked, internally. I do wonder how they react when their plans end up in ruins?

As I wrapped my hands around the closest girl next to me and started snoozing…

~~~

Both Serafall and Latia looked at the sleeping form of their Master. Well, Latia tried to look from a different angle, since she was the one who ended up as hugging pillow to her Master.

*Sigh*

"He does that when he feels like ruining our carefully crafted plans…" Serafall said with a sigh.

"Not the first time then?" Latia said softly as she tried to position herself properly. By this point, she has this feeling she will be spending quite a bit of time in this position.

"At least 4 times now." The black-haired Satan said as she ended up close to her Master preparing to sleep. Well, she wanted to drain him out for a bit and get a chance to mention about turning Sona into Magic Girl…

Well, she can do it later…

"I see… then I need to rethink some of my ideas…" Latia said with a thoughtful look before snuggling herself into her Master's hair. Here she was wanting to enjoy his attention…

Turns out he likes messing with their plans…

~~~~~~Later~~~~~~

It was the beginning of Summer and it was time for the genetic upgrades which Marcus was waiting for nearly half a year.

At least the first session out of at least 5…

The pillars and the maids were finally able to see the rumoured biological wing of the workshop area.

None of them knew where it was. Or, how to get there. So they were quite shocked to realise that Marcus used one of the classic tricks of hiding 30% of the base behind a holographic wall.

One moment there was a wall, next one it turned into corridor…

It was even embarrassing that devil ladies forgot about such a commonly used trick…

Still though after arriving at this wing they were slightly freaked out how different it was. Marcus went whole 'lab' play for this. Meaning white lab coat. Pressurised rooms, cleaning points.

By cleaning points, they were going through a barrier like fields where magic will clean them off. So that no bacteria or other things could get into… over the top. But, their Master is over the top person.

While everyone was looking at the lab the blonde bombshell devil girl, and the newest girlfriend of Marcus was looking at the mysterious Head Maid which turns out to be the current Lucifer's Queen.

'No wonder she barely around… I am here close to two months and this is the first time I am seeing her…'

'But, how in Satan's name did Marcus bind an Extra Devil? They are not related…' That moment the Blonde realised that he most likely used the concept of Lucifer himself. Thus binding the Servant houses of the Satan…

Then of course… the Bael Pillar… Current Lucifer's mother… Latia was quite a bit shaken seeing this woman here. Alongside Grayfia, Marcus had the means to cripple her race without even invading the Underworld. He could cripple Sirzechs quite a bit with these two pieces.

'Not that he needs much to end us in first place…'

After taking a deep breath the blonde beauty looked at nervous-looking Quinella.

It is quite impressive how much the Artificial Intelligence was nervous even through the A.I was the one who did all the work so, it should be the most confident of them all.

"How dangerous this is? Genetic manipulation is something no race dares to touch. Just like how United Nations got a law passed so did the supernatural world. Even if someone does run experiments on this it's a heavily guarded secret." Velenala said to the group, next to her Grayfia nodded. The silver-haired maid is nervous for her Master.

[There is less than 0.001% chance of anything bad happening. That percentage is akin to an alien invasion happening in the next 5 minutes. I spend close to 5.5 million simulations. From what my Master had eaten yesterday to what he could have eaten. Countless possible what-If…]

Venelana just got reminded that she is dealing with a fanatic of her Master. A most perfect artificial intelligence to have to run things… and most scariest of them all.

[The process will be seamless. My Master doesn't like when a test subject has to go through pain. It's a sign of failure as an Inventor. So, I developed a method, a chamber where specially prepared gases will flow it]

As Quinella said that everyone looked at the chamber in front of them. Venelana and Grayfia though would look at this Holographic woman with some disbelief. They were not been here for a few months and Marcus already is working on creating life? Building space stations, taking over the nation? Why everything is happening so fast!?

The tamest of the group was the pair of Maids who were properly living with Marcus they know this will be okay. As they know the full capacity of Aurora. Still, though, nervousness was there.

The chemical chamber was nothing like anyone thought it would be. They expected a full metal like room with extremely thick doors. But it was nothing more than a glass room. They can see what is happening inside.

"Well, I am ready. Begin." Marcus said via comms.

Quinella nodded at him. And the room started to get flooded by blue gases… then green… followed by red…

It was a weird kind of show… everyone watched at their Master vital signs… while the devils tapped on the connection they have with their Master. It's the best kind of way to know that he was alive and well…

In the end, the session was boring… something akin to a medical check-up…

Quinella sighed in relief… seeing that it was over and the changes are there…She then turned around and looked at Latia and Serafall.

"You two… I am watching you. No strenuous activities when these sessions are in place." The Artificial Intelligence motioned with her fingers that she is watching.

The blonde and the black-haired devils slowly nodded with a sweaty forehead… here goes their plans...